VLT
®
8000 AQUA
■
Analog inputs
Two analog inputs for voltage signals (terminals 53 and
54) are provided for reference and feedback signals.
Furthermore, an analog input is available for a current
signal (terminal 60). A thermistor can be connected
to voltage input 53 or 54. The two analog voltage
inputs can be scaled in the range of 0-10 V DC; the
current input in the range of 0-20 mA.
The table below gives the possibilities for
programming the analog inputs.
Parameter 317
Time out
and 318
Function after time
out
allow activation of a time-out function on all analog
inputs. If the signal value of the reference or feedback
signal connected to one of the analog in-put terminals
drops to below 50% of the minimum scaling, a function
will be activated after the time out determined in
parameter 318,
Function after time out
.
Analog inputs
terminal no.
53(voltage)
54(voltage)
60(current)
parameter
308
311
314
Value:
No operation
(NO OPERATION)
[0]
[0]
✭
[0]
Reference
(REFERENCE)
[1]
✭
[1]
[1]
✭
Feedback
(FEEDBACK)
[2]
[2]
[2]
Thermistor
(THERMISTOR)
[3]
[3]
308 Terminal 53, analog input voltage
(AI [V] 53 FUNCT.)
Function:
This parameter is used to select the required
function to be linked to terminal 53.
Description of choice:
No operation
Is selected if the frequency converter is
not to react to signals connected to the terminal.
Reference
Is selected to enable change of reference
by means of an analog reference signal. If reference
signals are connected to several inputs, these
reference signals must be added up.
Feedback
If a feedback signal in connected,
there is a choice of a voltage input (terminal 53 or
54) or a current input (terminal 60) as feedback.
In the case of zone regulation, feedback signals
must be selected as voltage inputs (terminals 53
and 54). See
Feedback handling
.
Thermistor
Is selected if a motor integrated thermistor
(according to DIN44080/81) should stop the frequency
converter in case of motor overtemperature. The
cut-out value is 3 kohm. If a motor features a thermal
switch instead, this can also be connected to the
input. If motors run in parallel, the thermistors/thermal
switches can be connected in series (total resistance
< 3 kohm). Parameter 117
Motor thermal protection
must be programmed for
Thermal warning
[1] or
Thermistor trip
[2], and the thermistor must be
inserted between terminal 53 or 54 (analog voltage
input) and terminal 50 (+10 V supply).
A motor thermistor connected to terminals 53/54
must be double isolated to obtain PELV.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.83.A2.02 - VLT is a registered Danfoss trademark
122